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Derivative Financial Instruments - Cash Flow Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Cash Flow Hedges        
Maximum length of time hedging exposure to variability in future cash flows for forecasted transactions     4 years 8 months 12 days  
Net losses reported in AOCI related to active hedges of forecasted transaction $ 99.7   $ 99.7  
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships 0.5 $ 21.2 (21.2) $ 21.8
Net gains (losses) expected to be reclassified from accumulated OCI into net income in the next 12 months     21.3  
Interest rate contracts | Fixed maturities, available-for-sale        
Cash Flow Hedges        
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships (55.5)   (99.7)  
Interest rate contracts | Investment contracts        
Cash Flow Hedges        
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships 2.5   12.0  
Foreign exchange contracts | Fixed maturities, available-for-sale        
Cash Flow Hedges        
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships $ 53.5 $ 21.2 $ 66.5 $ 21.8